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(B) The reactivity of benzyl halides towards $S_{N}2$ reactions is primarily governed by the electronic effects of substituents on the benzene ring. E

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$(II) > (III) > (IV) > (I)$

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(B) The reactivity of benzyl halides towards $S_{N}2$ reactions is primarily governed by the electronic effects of substituents on the benzene ring. Electron-withdrawing groups (EWGs) like $-NO_2$ increase the reactivity towards $S_{N}2$ by stabilizing the transition state through their $-I$ (inductive) and $-R$ (resonance) effects.In compound $(II)$,the two $-NO_2$ groups are at the ortho and meta positions,exerting strong $-I$ and $-R$ effects. In compound $(III)$,the two $-NO_2$ groups are at the meta and para positions,exerting $-I$ and $-R$ effects,but the overall electron-withdrawing strength is slightly less than in $(II)$ due to the positioning.In compound $(IV)$,the two $-NO_2$ groups are at the meta positions,exerting only $-I$ effects.Compound $(I)$ has no electron-withdrawing groups.Therefore,the decreasing order of reactivity is $(II) > (III) > (IV) > (I)$.

The decreasing order of reactivity of the following compounds towards nucleophilic substitution $(S_{N}2)$ is :

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